Securing a PCB in a plastic and metal housing

ABSTRACT

Described herein is a system and method for securing a printed circuit board without the use of screws in a housing assembly comprising a bottom housing made of plastic and a top housing made of metal. The top housing comprises a plurality of ribs. The bottom housing comprises a plurality of flexible snap arms each having a head portion, which includes an angled lower face, a horizontal crush rib, and a vertical crush rib. Upon coupling of the assembly, the ribs exert a horizontal force on the flexible snap arms resulting in climbing of the angled lower face further onto the printed circuit board. The horizontal force may also crush the horizontal crush ribs allowing for increased flexibility between the components to adjust for interference, preventing potential damage to the printed circuit board. Vertical forces may also crush the vertical crush ribs allowing for increased flexibility between the components.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the benefit of U.S. provisional application No.62/377,330 filed on Aug. 19, 2016, which is incorporated by reference asif fully set forth.

FIELD OF INVENTION

This invention relates to a plastic and metal housing for securing aprinted circuit board.

BACKGROUND

When securing a printed circuit board in a housing there is a variation,or tolerance, of the board thickness of the printed circuit board, thetop and bottom housing snap features, and the top and bottom housingprinted circuit board support features. These tolerances need to becompensated for to ensure that the printed circuit board is heldsecurely, and is prevented from movement or vibration. In order tocompensate for the above-referenced tolerances, crush ribs (or crumplezones), are typically used on either the top or bottom housing in anassembly not using screws.

In the case of some printed circuit board modules, there are connectorsassociated with the printed circuit board module that need to be locatedat a precise height. Because crush ribs are crushed, or compressed, uponassembly of the top and bottom housing, the crush ribs cannot be locatedon the housing component located on the same side of the housingassembly as the connectors because the height of the connectors willvary depending upon the degree of crushing of the crush ribs. Thisamount of variance would not allow for the height of the connectors tobe maintained. In order to achieve a precise height of the connectorsupon assembly of the printed circuit board housing, a hard strut isneeded to control the height, and the crush ribs would have to bepositioned on the housing component opposite that of the one located onthe same side as the connectors, which in this instance would be the tophousing.

In the case of some printed circuit boards, there are also temperatureissues, wherein the top housing heats up. In order to dissipate thisexcess heat away and expel it into the air, a heat conductive paste orpad can be used to make a thermal connection with the top housing to tryand draw the heat away. Because the heat conductive properties ofplastic are not as good as those of metal, a plastic housing cannot beused in situations where the top housing of a printed circuit boardheats up beyond an acceptable amount. In these situations, a metalhousing cover is preferred to better dissipate the excess heat.

However, if the connectors are associated with the bottom housingcomponent and the opposing top housing component is made of metal, thecrush ribs could not be located on the bottom housing or the top metalhousing because the height of the connectors could vary upon assembly ifthe crush ribs were located on the bottom housing as described above,and the crush ribs would not “crush” and only dig into the printedcircuit board if they were located on the top metal housing.

Accordingly it is desirable for crush ribs to be located on the side ofthe printed circuit board assembly having a top portion that is metal,wherein the crush ribs are still “crushable.”

SUMMARY

In an aspect, the invention relates to a system and method for securinga printed circuit board, comprising a bottom housing component formed ofplastic and a top housing component formed of metal. The top housingcomponent comprises a plurality of ribs and the bottom housing componentcomprises a plurality of flexible snap arms each having a bottom bodyportion and a top head portion, which extends over the plane of theprinted circuit board. The head portion of each flexible snap armcomprises a horizontal crush rib, a vertical crush rib, and an angledlower face.

Upon coupling of the bottom housing component with the top housingcomponent the ribs exert a horizontal force on the flexible snap armsresulting in climbing of the angled lower face further onto a topsurface of the printed circuit board. This horizontal force may also“crush” the horizontal crush ribs allowing for increased flexibilitybetween the components to adjust for interference, preventing potentialdamage to the printed circuit board. Vertical forces may also “crush”the vertical crush ribs allowing for increased flexibility between thecomponent and protection to prevent components from twisting orbreaking.

Each of these forces, either alone or in combination, help secure theprinted circuit board firmly within the housing assembly while alsoproviding enough flexibility to compensate for variations in size of thehousing components and printed circuit board to ensure a vibration freeassembly. In addition, the presence of the flexible snap arms may act asan intermediary between the metal housing and the printed circuit board,allowing the plastic to act as an insulator, preventing the metal fromtouching the printed circuit board itself.

The housing assembly disclosed herein does not require the use ofscrews, allowing for ease of assembly. Benefits of this may includefaster production time and decreased costs with regard to materials andlabor.

BRIEF DESCRIPTION OF THE DRAWINGS

A more detailed understanding may be had from the following description,given by way of example in conjunction with the accompanying drawingswherein:

FIG. 1A is a perspective view of the housing assembly for securing aprinted circuit board, including a bottom housing component assembledwith printed circuit board. The top housing component is not included.

FIG. 1B is a perspective view of the housing assembly for securing aprinted circuit board, including a bottom housing component assembledwith printed circuit board, and a top housing component positioned abovein the unassembled state.

FIG. 1C is an enlarged view of a portion of the housing assembly forsecuring a printed circuit board of FIG. 1A, including the bottomhousing component and printed circuit board, but not the top housingcomponent.

FIG. 2 is a perspective view of a top housing component of the housingassembly for securing a printed circuit board.

FIG. 3A is a perspective view of the housing assembly for securing aprinted circuit board, including the bottom housing component, the tophousing component, and the printed circuit board in the assembled state.

FIG. 3B is a perspective view of the housing assembly for securing aprinted circuit board, including the bottom housing component, the tophousing component, and the printed circuit board in the assembled state,with the top housing component shown as a transparent component forillustrative purposes.

FIG. 4 is an enlarged view of a portion of the housing assembly forsecuring a printed circuit board from within the assembly, including thebottom housing component, the top housing component, and the printedcircuit board in the assembled state.

FIG. 5 is a perspective rear view of the housing assembly for securing aprinted circuit board, including the bottom housing component assembledwith the printed circuit board, and a top housing component positionedabove in the unassembled state.

FIG. 6 is a flow chart detailing a method of securing a printed circuitboard within a housing assembly comprising a plastic bottom housingcomponent and a metal top housing component.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1A and 1B illustrate a perspective view of the housing assemblyfor securing a printed circuit board 100 in the unassembled state. Theprinted circuit board 100 is assembled with the bottom housing component300. The top housing component 200 is not assembled with the bottomhousing component 300 or printed circuit board 400.

The bottom housing component 300 is formed from a plastic material.Non-limiting examples may include materials such as polypropylene,nylon, and polycarbonate. In an exemplary embodiment, the bottom housingcomponent 300 is formed from a softer material, such as polypropylene.

The bottom housing component 300 comprises a plurality of flexible snaparms 310 located on the sides of the bottom housing component 300extending upward above the plane of the printed circuit board 400. In anembodiment, there may be one flexible snap arm 310 located on a sidewall of the bottom housing component 300 and another flexible snap arm310 located on an opposing side wall of the bottom housing component300. In another embodiment, a plurality of flexible snap arms 310 may belocated on a side wall of the bottom housing component 300 and aplurality of flexible snap arms 310 may be located on an opposing sidewall of the bottom housing component 300. In another embodiment, allfour side walls of the bottom housing component 300 comprise at leastone flexible snap arm 310 on each side wall. In the instance where aplurality of flexible snap arms 310 are located on a given side wall,the distance between each flexible snap arm 310 may be the same or mayvary.

In an exemplary embodiment, two flexible snap arms 310 may be located ona side wall of the bottom housing component 300 and two flexible snaparms 310 may be located on an opposing side wall of the bottom housingcomponent 300. Each of the flexible snap arms 310 located on a givenside wall is paired directly opposite a corresponding flexible snap arm310 on the opposing side wall.

FIG. 1C illustrates an enlarged view of the bottom housing component 300including a printed circuit board 400 within. The top housing component200 is not included. A magnified view of a flexible snap arm 310 locatedon the bottom housing component 300 can be seen. When a printed circuitboard 400 is contained within the housing assembly 100, each flexiblesnap arm 310 extends from below the plane of the printed circuit board400 to above the plane of the printed circuit board 400.

The flexible snap arms 310 are made of the same material used to makethe bottom housing component. Non-limiting examples may includematerials such as polypropylene, nylon, and polycarbonate. In anexemplary embodiment, the flexible snap arms 310 are formed from asofter material, such as polypropylene.

Although there are not necessarily any distinct boundaries between a topportion of the flexible snap arm 310 and a bottom portion of theflexible snap arm 310, the top portion can be considered the headportion 311 of the flexible snap arm 310 and the bottom portion can beconsidered the body portion 312 of the flexible snap arm 310. In anembodiment, the head portion 311 comprises the portion of the flexiblesnap arm 310 above a lowest point of an angled lower face 313, describedbelow, and the body portion 312 comprises the portion of the flexiblesnap arm 310 below the lowest point of the angled lower face 313. In anembodiment, the flexible portion of the flexible snap arm 310 is theportion below the level of the printed circuit board 400 comprising thebody portion 312.

In an exemplary embodiment, the head portion 311 of each flexible snaparm 310 includes at least a horizontal crush rib 320, a vertical crushrib 321, and the angled lower face 313. Each horizontal crush rib 320 islocated on an exterior facing surface of each respective flexible snaparm 310 and runs vertically along a portion of the exterior facingsurface of the head portion 311. In an exemplary embodiment, a singlehorizontal crush rib 320 is located on the exterior facing surface ofeach respective flexible snap arm 310.

In another embodiment, a plurality of horizontal crush ribs 320 islocated on the exterior facing surface of each respective flexible snaparm 310. The plurality of horizontal crush ribs 320 may be lined up withone another, running in parallel. In an embodiment, each of thehorizontal crush ribs 320 runs vertically along a portion of theexterior facing surface of the head portion 311 of each flexible snaparm 310. In another embodiment, each of the horizontal crush ribs 320runs horizontally along a portion of the exterior facing surface of thehead portion 311 of each flexible snap arm 310.

Each horizontal crush rib 320 is formed from a material that isconfigured to crush when a force is exerted upon it. In an exemplaryembodiment, each horizontal crush rib 320 is formed from the samematerial used to make the bottom housing component. This crushing of thehorizontal crush ribs 320 allows for extra interference to be designedinto the housing assembly taking advantage of the flexible material thatthe crush ribs 320.

Each vertical crush rib 321 is located on a top surface of eachrespective flexible snap arm 310 and runs along the head portion 311 inthe longitudinal direction. In an exemplary embodiment, a singlevertical crush rib 321 is located on the top surface of each respectiveflexible snap arm 310.

In other embodiments, a plurality of vertical crush ribs 321 is locatedon the top surface of each respective flexible snap arm 310. Theplurality of vertical crush ribs 321 may be lined up with one another,running in parallel. In an embodiment, each of the vertical crush ribs321 runs along the head portion 311 of each flexible snap arm 310 in thelongitudinal direction. In another embodiment, each of the verticalcrush ribs 321 runs along the head portion 311 of each flexible snap arm310 perpendicular to the longitudinal direction.

Each vertical crush rib is formed from a material that is configured tocrush when a force is exerted upon it. In an exemplary embodiment, eachvertical crush rib 321 is formed from the same material used to make thebottom housing component. This crushing of the vertical crush ribs 321helps to secure the printed circuit board within the housing assemblywhen the top housing component couples with the bottom housingcomponent, adding strength to the assembly and preventing any failure ofthe flexible snap arm 310 due to vertical forces from lower connector420 insertion forces.

This crushing of both the horizontal crush ribs 320 and the verticalcrush ribs 321 also allows for extra interference to be designed intothe housing assembly taking advantage of the flexible material that thecrush ribs 320, 321 are made of. The extra interference provided by thecrush ribs 320, 321 are from “crushing” by the force(s) being exertedupon them.

With regard to the location of the crush ribs 320, 321, they do not makedirect contact with the printed circuit board 400 in the housingassembly disclosed herein. This is advantageous in part because crushribs in general can have a sharp edge, which may dig into the printedcircuit board 400 with a potentially damaging force if they were to havedirect contact with it. Having the crush ribs 320, 321 facing the sidewalls and top surface of the top housing component 200, respectively,helps to prevent this particular damage from occurring to the printedcircuit board 400.

With regard to the shape of the horizontal crush ribs 320, as referencedby the longitudinal edge that protrudes outward, running parallel to thelongitudinal axis of the flexible snap arm 310, it may be triangular,circular, or other so long as the crush rib remains compressible uponexertion of a horizontal force upon it. In an exemplary embodiment, theshape of the horizontal crush rib is triangular.

With regard to the shape of the vertical crush rib, as referenced by thelongitudinal edge that protrudes outward running along the top surfaceof the flexible snap arm 310, it may be triangular, circular, or otherso long as the crush rib remains compressible upon exertion of avertical force upon it. In an exemplary embodiment, the shape of thevertical crush rib is triangular.

With regard to the size of the crush ribs 320, 321, this may also varyand be adjusted to achieve a desired compression, or “crushing”. Varyingthe size of the crush ribs 320, 321 may allow for a desired interferenceto be achieved between the housing components 200, 300 and the printedcircuit board upon assembly. This may also minimize the effects oncompensation as a result of variation in size of any of these componentsof the housing assembly 100.

The angled lower face 313 of each respective flexible snap arm 310 islocated on a bottom surface of the head portion 311. A lowest portion ofthe angled lower face 313 is positioned proximal to the body portion 312of each respective flexible snap arm 310 and a highest portion of theangled lower face 313 is positioned distal to the body portion 312 ofeach respective flexible snap arm 310.

When the printed circuit board 400 is positioned within the bottomhousing component 300, the angled lower face 313 contacts a top surfaceof the printed circuit board 400. In an exemplary embodiment, the pointof contact of the printed circuit board 400 with the angled lower face313 is the edge of the printed circuit board 400.

When the top housing component 200 is coupled with the bottom housingcomponent 300 including the printed circuit board 400, the angled lowerface 313 climbs further onto the top surface of the printed circuitboard 400. The coupling of the top housing component 200 exerts aninward force on the flexible snap arm 310, and a subsequent downwardforce on the angled lower face 313 causing it to travel further past theedge of the printed circuit board 400.

In an embodiment, the top housing component 200 formed of a metal doesnot make direct contact with the printed circuit board 400. In essencethe plastic may be used as an insulator for the printed circuit board400.

The bottom housing component 300 may further include snap arms 330located on a side wall of the bottom housing component 300. Each snaparm 330 extends vertically along the side wall. In an embodiment thesnap arm 330 may extend vertically past the plane of a printed circuitboard 400 when placed in the bottom housing component 300. The snap armsmay be formed of a plastic material. Non-limiting examples includematerials such as polypropylene, nylon, and polycarbonate. In anexemplary embodiment, the snap arms 330 are made of the same material asthe bottom housing component 300.

In an exemplary embodiment, there may be a single snap arm 330 locatedon each side wall of the bottom housing component 300. In anotherembodiment, a plurality of snap arms 300 may be located on each sidewall of the bottom housing component 300. In yet another embodiment asingle snap arm 300 may be located on a side wall and another singlesnap arm 330 located on an opposing side wall. Further a plurality ofsnap arms 330 may be located on opposing side walls only. In certainembodiments, the number of snap arms 330 located on one side wall of thebottom housing component 300 either matches or does not match the numberof snap arms 330 located on the other side walls of the bottom housingcomponent 300.

The snap arms 330 are configured to engage with a corresponding hook 230located on the top housing component 200, as illustrated in FIG. 2. Eachhook 230 is located on an exterior surface of a side wall of the tophousing component 200, oriented to couple with a corresponding snap arm330. The configuration of the snap arms may be as described in theforegoing for snap arms 330. In an exemplary embodiment, each snap arm330 is paired with a corresponding hook 230 upon assembly of the housingcomponents 200, 300. In other embodiments, only some of the hooks 230are paired with a corresponding snap arm 330 upon assembly of thehousing components 200, 300.

The hooks 230 may be made of a metal material. Non-limiting examples mayinclude materials such as aluminum, magnesium, and steel. In anexemplary embodiment, the hooks 230 are formed from the same materialused to form the top housing component 200.

FIG. 2 illustrates a perspective view of the top housing component 200.The top housing component 200 is made of a metal material. Non-limitingexamples may include materials such as aluminum, magnesium, and steel.

In an embodiment, the top housing component 200 further comprises aplurality of ribs 220 located on an inner surface of the side walls ofthe top housing component 200 extending vertically from an inner topsurface at its proximal end, along at least a portion of the innersurface of the side wall, and terminating at its distal end at or beforethe bottom surface of the side walls

The ribs 220 are formed from a metal material. Non-limiting examples mayinclude materials such as aluminum, magnesium, and steel. In anexemplary embodiment, the ribs 220 may be formed from the same materialas the top housing component 200. In an embodiment, the ribs 220 may beformed from a different material than the top housing component 200.

In an embodiment, there may be one rib 220 located on an inner surfaceside wall of the top housing component 200 and another rib 220 locatedon an opposing inner surface side wall of the top housing component 200.In another embodiment, a plurality of ribs 220 may be located on aninner surface side wall of the top housing component 200 and a pluralityof ribs 220 may be located on an opposing inner surface side wall of thetop housing component 200, wherein the number of ribs 220 located on oneinner surface side wall of the top housing component 200 either matchesor does not match the number of ribs 220 located on the opposing innersurface side wall of the top housing component 200. In anotherembodiment, all four inner surface side walls of the top housingcomponent 200 comprise at least one rib 220 on each side wall. Wherein aplurality of ribs 220 is located on a given inner surface side wall thedistance between each rib 220 may be the same or may vary.

In an exemplary embodiment, two ribs 220 may be located on an innersurface side wall of the top housing component 200 and two ribs 220 maybe located on an opposing inner surface side wall of the top housingcomponent 200. Each of the ribs 220 located on a given inner surfaceside wall is paired directly opposite a corresponding rib 220 on theopposing inner surface side wall.

In an exemplary embodiment, each flexible snap arm 310 is paired with acorresponding rib 220 upon assembly of the housing components 200, 300.In an embodiment, each rib 220 is paired with a corresponding flexiblesnap arm 310 upon assembly of the housing components 200, 300.

FIG. 3A illustrates the housing assembly 100 in the assembled state. Atop housing component 200 is coupled with a bottom housing component300, wherein at least a snap arm 330 is shown, and is engaged with acorresponding hook 230 (not shown). What cannot be seen are at least theprinted circuit board 400, the ribs 220, the flexible snap arms 310, thehorizontal crush ribs 320, the vertical crush ribs 321, and the angledlower face 313 of the flexible snap arms 310.

FIG. 3B illustrates an embodiment of the housing assembly 100 in theassembled state whereby the top housing component is shown as atransparent component for illustrative purposes only. This embodiment ofthe housing assembly 100 illustrates not only the top housing component200, bottom housing component 300, printed circuit board 400, and snaparms 330, but also the printed circuit board 400, the ribs 220, and theflexible snap arms 310.

In an embodiment, upon coupling of the housing components 200, 300 withone another and the printed circuit board 400, the ribs 220 exert ahorizontal force on the horizontal crush ribs and on a head portion 311of the flexible snap arm 310 causing the angled lower face portion ofthe head portion 311 to climb further onto the printed circuit board400.

FIG. 4 illustrates an enlarged view of the housing assembly 100 fromwithin the housing assembly in the coupled state, narrowing in on thearea surrounding the flexible snap arm 310 and a corresponding rib 220.Initially, a printed circuit board 400 is coupled with the bottomhousing assembly 300 as shown in FIGS. 1A and 1B, wherein the angledlower face portion 313 of the flexible snap arm 310 is in contact withthe top surface of the printed circuit board 400, which may help tomaintain the printed circuit board 400 within the bottom housingassembly 300 even before the top housing component 200 is coupled inplace. In an exemplary embodiment, the point of contact of the printedcircuit board 400 with the angled lower face 313 is the edge of theprinted circuit board 400.

Upon coupling of the top housing component 200 with the bottom housingcomponent 300 including the printed circuit board 400, the ribs 220located on the inner surface of the side walls of the top housingcomponent 200 exert a horizontal force on the horizontal crush rib 320.The horizontal force may be transferred, at least in part, to the headportion 311 of the flexible snap arm 310 pressing it inward in thecorresponding direction of the horizontal force itself. Because theflexible snap arm 310 has an angled lower face 313, the horizontal forceexerted on the head portion 311 of the flexible snap arm 310 causes theoverhanging portion, which is the head portion 311 including the angledlower face 313, to move forward, climbing further onto the printedcircuit board 400. The interference between the flexible snap arm 310and the printed circuit board 400 will increase, forcing the printedcircuit board 400 vertically downwards.

In an embodiment, the angled lower face 313 is fully engaged with theprinted circuit board 400, and the printed circuit board cannot bepressed down any further. In this case, any “extra” horizontal forcefrom the rib 220 of the top housing component 200 pressing on thehorizontal crush rib 320, that is not being used to further press theprinted circuit board 400 vertically downward, may be used to “crush”the horizontal crush rib 320. This “crushing” of the horizontal crushrib 320 by the horizontal force can prevent any excessive forces frombeing transferred to the printed circuit board 400.

Because the horizontal crush ribs 320 are attached to a vertical edge ofthe head portion 311, they can take advantage of the flexible nature ofthe flexible snap arms 310. In an embodiment, the flexible snap arm 310is relatively more stiff, which may allow for increased “crushing” ofthe horizontal crush rib 320 as the horizontal forces are applied to thehorizontal crush rib 320. In another embodiment, the flexible snap arm310 is relatively more flexible, which may allow for the head portion311 of the flexible snap arm 310 to be moved forward to a greater extentthan in the previous embodiment as the horizontal forces are applied tothe horizontal crush rib 320. This latter embodiment may allow for extrainterference to be designed into the housing assembly with less relianceon the actual “crushing” of the horizontal crush ribs 320.

In addition to the horizontal force exerted by the ribs 220 of the tophousing component 200, a vertical force is exerted on the vertical crushribs 321. This vertical force is exerted at least in part by a topsurface of the top housing component 200 upon coupling of the tophousing component 200 with the bottom housing component 300. Otherupward vertical forces, including but not limited to insertion forcesfrom connecting components of the connector 420 to the printed circuitboard 400, may exert a vertical force on the vertical crush ribs 321.These vertical forces can “crush” the vertical crush ribs 321.

In an embodiment, the interference generated between the top surface ofthe top housing component 200 and the vertical crush ribs 321 upon“crushing” can also prevent any failure of the flexible snap arms 310due to vertical forces, including insertion forces from connectingcomponents of the connector 420. The interference generated can alsohelp to prevent any twisting or lifting in response to a massive amountof force, which could result in breaking of at least a rib 220.

FIG. 5 illustrates a perspective view of the rear side of the housingassembly 100, wherein the top housing component 200 is positioned above,and not coupled to the bottom housing component 300 and printed circuitboard 400. Each of the components represented above in FIG. 1 areillustrated herein.

With regard to the connectors, any type of connector may be used in thisassembly 100. Non-limiting examples include board to board connectorsand board to cable connectors. In an embodiment, the board to cableconnectors could be soldered onto the printed circuit board 400 in theirentirety, or just the female portion of the connector could be solderedonto the printed circuit board 400.

This disclosure also represents a method 600 for securing a printedcircuit board within the housing assembly disclosed in the foregoing,wherein the bottom housing component is formed of plastic and the tophousing component is formed of metal. In some implementations, the stepscan be re-arranged or omitted.

A printed circuit board 400 is inserted 601 into a bottom housingcomponent 300 of the housing assembly 100. Upon insertion, the flexibleportion of the flexible snap arms 310 flexes to allow the head portion311 of the flexible snap arms 310 to move back and permit the printedcircuit board 400 to be inserted into the bottom housing component 300.Once the printed circuit board 400 is inserted, the flexible portion ofthe flexible snap arms 310 flexes back in the direction of its originalposition to allow the head portion to contact a top surface of theprinted circuit board 400, securing it within the bottom housingcomponent 300. An angled lower face 313 of the plurality of flexiblesnap arms 310 rests, or presses on the top surface of the printedcircuit board 400 to secure it within the bottom housing component 300.

A top housing component 200 is aligned 602 with the bottom housingcomponent 300. In an embodiment aligning the housing components 200, 300may include aligning 603 the plurality of flexible snap arms 310,located on the bottom housing component 300, with a corresponding rib220 of a plurality of ribs 220, located on an inner side surface of thetop housing component 200. In an embodiment, aligning the housingcomponents 200, 300 may include aligning 604 the plurality of hooks 230located on an exterior side wall of the top housing component 300 with acorresponding snap arm 330 of a plurality of snap arms 330, located onthe bottom housing component 300.

In an embodiment, each of these steps, including aligning 603 of theflexible snap arms 310 with the ribs 220 and aligning 604 the hooks 230with the snap arms 330 may occur alone or in combination until thehousing components 200, 300 are aligned. In an embodiment, each of thesesteps may occur separately or simultaneously until the housingcomponents 200, 300 are aligned. In another embodiment, any one of suchaligning steps 603, 604 may be re-arranged or omitted.

Once the housing components 200, 300 are aligned, they are then coupledtogether with the printed circuit board 400 in place. Coupling 605 mayinvolve pressing, snapping, or any other action known in the art thatmay be used to assemble the two housing components 200, 300 together.

In an embodiment, this horizontal force may be transferred, at least inpart, to the head portion 311 of the flexible snap arms 310. Flexing 607of the flexible snap arms occurs such that the head portion 311 ispressed inward in the corresponding direction of the horizontal forceitself. Because the flexible snap arms 310 have an angled lower face313, the horizontal force exerted on the head portion 311 of theflexible snap arms 310 causes the overhanging portion, which is the headportion 311 including the angled lower face 313, to move forward,climbing further onto the printed circuit board 400. The change inheight from the angled lower face 313 can create more verticalinterference as it slides forward. This increased interference betweenthe flexible snap arms 310 and the printed circuit board 400 may resultin pressing 608 of the printed circuit board 400 vertically downwards tosecure the printed circuit board 400 vertically.

When the printed circuit board 400 cannot be pressed down any further,any additional horizontal force may be used to “crush” the horizontalcrush ribs 320. This “crushing” 609 of the horizontal crush ribs 320 bythe horizontal force can prevent any excessive forces from beingtransferred to the printed circuit board 400.

In an embodiment, where the flexible snap arms 310 are relatively stiff,the “crushing” 609 of the horizontal crush ribs 320 may be greater asthe horizontal force is applied than if the flexible snap arms 310 aremore flexible.

In another embodiment, where the flexible snap arms 310 are relativelymore flexible, the “crushing” 609 of the horizontal crush ribs 320 maybe less as the horizontal force is applied than if the flexible snaparms 310 are more stiff. In this embodiment, the head portion 311 of theflexible snap arm 310 may be able to move forward to a greater extentthan in the previous embodiment. This could allow for extra interferenceto be designed into the housing assembly 100 with decreased reliance onthe actual “crushing” of the horizontal crush ribs 320.

Upon coupling 605 of the housing components 200, 300, the top surface ofthe top housing component 200 may exert a vertical force downward on thevertical crush rib 321 “crushing” 610 it.

In an embodiment, other vertical forces may exert a vertical forceupward on the vertical crush ribs 321 “crushing” 611 it. These upwardvertical forces may include, but are not limited to, insertion forcesfrom connecting components of the connector 420 to the printed circuitboard 400. These vertical forces can “crush” 611 the vertical crush ribs321.

Both the downward vertical forces and the upward vertical forces, alongwith the “crushing” 610, 611 of the vertical crush ribs 321, may help toprevent any upward movement or failure of the flexible snap arms 310 dueto vertical forces, including vertical forces generated from insertionof components into the connector 420 of the printed circuit board 400.

In an embodiment, coupling may further comprise coupling 612 of theplurality of hooks 230 with a respective snap arm 330 of the pluralityof snap arms 330. The design of the hook 230 and the snap arm 330 may beany design known by one of ordinary skill in the art for coupling twohousing components together. In a preferred embodiment, the hooks 230and the snap arms 330 are represented by those illustrated in theFigures. Other conventional means known in the art can be employed tocouple the housing components 200, 300 with one another.

In an embodiment, each of these steps involved in the coupling 605,including pressing 606 of the ribs 220 on the horizontal crush ribs 320;flexing 607 of the flexible snap arms 310 by a horizontal force causingthe angled lower face 313 to climb further onto the printed circuitboard 400; vertically pressing 608 the printed circuit board 400downwards; crushing 609 of the horizontal crush ribs 320; crushing 610of the vertical crush ribs 321 by a downward vertical force; crushing611 of the vertical crush ribs 321 by an upward vertical force; andcoupling of the hooks 230 with the snap arms 330, may occursimultaneously until the housing components 200, 300 are coupled.

In an embodiment, any of these steps involved in coupling 605 may occursimultaneously and cooperate together to further secure the printedcircuit board 400 within the housing assembly 100.

In an embodiment, any of these steps involved in the coupling 605 may bere-arranged or omitted.

Although the features and steps are described above in particularcombinations and order, one of ordinary skill in the art will appreciatethat each feature or step may be re-arranged or omitted.

What is claimed is:
 1. A housing assembly for securing a printed circuitboard comprising: a top housing component formed from a metal; a bottomhousing component formed from a plastic; and a printed circuit boardresiding in the bottom housing component, wherein the bottom housingcomponent includes a plurality of flexible snap arms, wherein each ofthe flexible snap arms comprises a head portion and a body portion, thehead portion is located above the plane of the printed circuit board andthe body portion is located below the plane of the circuit boardfollowing insertion of the printed circuit board in the bottom housingcomponent, the head portion includes an angled lower face located on abottom surface of the head portion, and the angled lower face climbsfurther onto the printed circuit board upon coupling of the top housingcomponent with the bottom housing component; the top housing componentincludes a plurality of ribs located on an inner side surface; and eachrib of the plurality of ribs exerts a horizontal force on correspondingflexible snap arms of the plurality of flexible snap arms upon couplingof the top housing component with the bottom housing component.
 2. Thehousing assembly for securing a printed circuit board of claim 1,wherein: the angled lower face comprises a lowest portion and a highestportion, the lowest portion of the angled lower face is positionedtowards the body portion of each respective flexible snap arm, and thehighest portion of the angled lower face is positioned away from thebody portion of each respective flexible snap arm.
 3. The housingassembly for securing a printed circuit board of claim 1 wherein thebottom housing component further comprises at least a snap arm and thetop housing component further comprises at least a hook, and a snap armof the at least a snap arm receives a corresponding hook of the at leasta hook upon coupling of the top housing component with the bottomhousing component.
 4. The housing assembly for securing a printedcircuit board of claim 1, wherein the printed circuit board furthercomprises at least a connector, and the connector is positioned on abottom surface of the printed circuit board on a side of the housingassembly comprising the bottom housing component.
 5. The housingassembly for securing a printed circuit board of claim 1, wherein thehead portion of each of the plurality of flexible snap arms includes atleast a horizontal crush rib that runs vertically along an exteriorfacing surface of the head portion, wherein each horizontal crush rib iscrushed by the horizontal force exerted by the plurality of ribs.
 6. Thehousing assembly for securing a printed circuit board of claim 5,wherein the head portion of each of flexible snap arm includes onehorizontal crush rib.
 7. The housing assembly for securing a printedcircuit board of claim 1, wherein the head portion of each of theflexible snap arms includes at least a vertical crush rib that runslongitudinally along a top surface of the head portion.
 8. The housingassembly for securing a printed circuit board of claim 7, wherein thehead portion of each of flexible snap arm includes one vertical crushrib.
 9. The housing assembly for securing a printed circuit board ofclaim 1, wherein the top housing component includes a top surface of thetop housing component, which exerts a vertical force downward on theplurality of crush ribs upon coupling of the top housing component withthe bottom housing component, crushing the vertical crush ribs.
 10. Thehousing assembly for securing a printed circuit board of claim 1,wherein the printed circuit board exerts a vertical force upward on theplurality of vertical crush ribs upon coupling of the top housingcomponent with the bottom housing component, crushing the vertical crushribs.
 11. A method for securing a printed circuit board, the methodcomprising: inserting the printed circuit board into a bottom housingcomponent that is formed from a plastic, wherein the bottom housingcomponent comprises a plurality of flexible snap arms that secure theprinted circuit board to the bottom housing component followinginsertion; aligning the bottom housing component with a top housingcomponent formed from a metal, wherein the top housing componentcomprises a plurality of ribs located on an inner side surface of thetop housing component; coupling the top housing component with thebottom housing component, wherein the plurality of ribs exerts ahorizontal force on the plurality of flexible snap arms upon coupling ofthe top housing component with the bottom housing component.
 12. Themethod for securing a printed circuit board of claim 11, whereininserting the printed circuit board further comprises flexing of theflexible snap arms outwards to receive the printed circuit board andflexing of the flexible snap arms inwards following insertion of theprinted circuit board.
 13. The method for securing a printed circuitboard of claim 11, wherein aligning the top housing component with thebottom housing component further comprises aligning the plurality ofribs with the plurality of flexible snap arms, wherein the plurality ofribs contacts the plurality of flexible snap arms.
 14. The method forsecuring a printed circuit board of claim 11, wherein aligning the tophousing component with the bottom housing component further comprisesaligning a plurality of hooks with a plurality of snap arms, wherein theplurality of hooks are located on at least side wall of the top housingcomponent, and the plurality of snap arms are located on at least a sidewall of the bottom housing component.
 15. The method for securing aprinted circuit board of claim 14, wherein upon coupling of the tophousing component with the bottom housing component the plurality ofhooks engages with the plurality of snap arms.
 16. The method forsecuring a printed circuit board of claim 11, wherein each flexible snaparm of the plurality of flexible snap arms comprises a head portion. 17.The method for securing a printed circuit board of claim 16, whereinupon coupling of the top housing component with the bottom housingcomponent the horizontal force exerted by the plurality of ribs on eachrespective flexible snap arm flexes the head portion of the flexiblesnap arm, located above the plane of the printed circuit board, whereinthe head portion comprises an angled lower face located on a bottomsurface of the head portion, and the angled lower face climbs furtheronto the printed circuit board pressing the printed circuit boardvertically downwards.
 18. The method for securing a printed circuitboard of claim 16, wherein upon coupling of the top housing componentwith the bottom housing component the horizontal force exerted by theplurality of ribs on each respective flexible snap arm crushes ahorizontal crush rib located on an exterior facing surface of the headportion of each flexible snap arm.
 19. The method for securing a printedcircuit board of claim 16, wherein upon coupling of the top housingcomponent with the bottom housing component a top surface of the tophousing component exerts a vertical force downwards on a vertical crushrib located on a top surface of the head portion of each respectiveflexible snap arm crushing the plurality of vertical crush ribs.
 20. Themethod for securing a printed circuit board of claim 19, wherein uponcoupling of the top housing component with the bottom housing componentthe printed circuit board exerts the vertical force upwards on avertical crush rib located on the top surface of the head portion ofeach respective flexible snap arm.